Self-assembled La0.7Sr0.3Fe0.9Ni0.1O3-δ-Ce0.8Sm0.2O2-δ composite cathode with a three-dimensional ordered macroporous structure for protonic ceramic fuel cells
No Thumbnail Available
Access rights
embargoedAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2024-09
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Solid State Ionics, Volume 412
Abstract
Self-assembled La0.7Sr0.3Fe0.9Ni0.1O3-δ-Ce0.8Sm0.2O1.9-δ (LSFN-SDC) composite cathode with a three-dimensionally ordered macroporous (3DOM) structure is synthesized using poly(methyl methacrylate) as the template for protonic ceramic fuel cells. The LSFN and SDC phases both distribute uniformly in the cathode. The SDC phase reduces the thickness of the walls of the 3DOM structure and thus hinders the bulk conduction of electrons. SDC also decreases the specific surface area and the surface oxygen reactivity of the cathode, leading to the suppression of the adsorption and dissociation of O2. However, the SDC phase provides the conduction pathway for oxygen ions and enlarges three phase boundary consequently, which facilitates the charge transfer steps. The thickness of the walls and the specific surface area of the composite cathode are both increased with the rise of the concentration of the nitrate precursor solution, resulting in the acceleration of the cathode process. Nevertheless, an excessive precursor concentration leads to the destroy of the 3DOM structure. The 3DOM composite cathode exhibits the lowest Rp of 0.039 Ω cm2, and a single cell with that cathode shows maximum power density of 1484 mW cm−2 at 700 °C. The cell exhibits a short-term stability of 120 h at 700 °C without noticeable degradation.Description
Publisher Copyright: © 2024 Elsevier B.V.
Keywords
Cathode, Doped ceria, Lanthanum ferrite, Protonic ceramic fuel cell, Three-dimensional ordered macroporous structure
Other note
Citation
Zhao, X, Zhang, J, Lu, X, Liu, W, Chen, J, Zhao, Y & Li, Y 2024, ' Self-assembled La 0.7 Sr 0.3 Fe 0.9 Ni 0.1 O 3-δ -Ce 0.8 Sm 0.2 O 2-δ composite cathode with a three-dimensional ordered macroporous structure for protonic ceramic fuel cells ', Solid State Ionics, vol. 412, 116582 . https://doi.org/10.1016/j.ssi.2024.116582